Crank pin grinder



April 16, 1940. c. J. cooK CRANK PIN GRINDER Filed May 21, 1938 2 Sheets-Sheet 1 April 16, 1940. c, COOK 2,197,684

CRANK PIN GRINDER Filed May 21, 1938 2 Sheets-Sheet 2 gwua/wto'n CARL J. C0 OK i rotates.

: 25 and certain parts of the grinder being shown sition upon the rocker arm 25 and is provided a 30 line 4-4 of Figure l;

Patented Apr. '16,' 1940 l 2,197,684

UNITED STATES PATENT OFFICE I I 2,197,684 4 CRANK PIN GRINDER Carl J icookKirwi mKans. v Application May 21, issa serial No. 209,342 'aclaims, (Cl. 51- 131 I This invention relates to crank pin grinders, with an upwardly extending shaft 22 carrying a and has for one of its objects the'productionflof pulley 23 around whicha belt 24 passes. I a simple and efiieient means for grinding a The hanger l8 also carriesaforwardly extendcrank pin and efficiently holding. the grinding ing rocker arm 25 which is secured near thelower toolin connection with the crank pin, whereby end of the hanger l8'and extends forwardly to' 5 I the various parts of the device areaut'omatically support the grinding mechanism. In carrying adjusted and the grindingwheel is held in conout the invention, the crank shaft 26 or work tact with the crank pin during its'rotation. upon which the grinding is to take place is' I A further object of this invention is the proheld between the lathe centers in the conventional 1, duction of a simple and efiicient' mounting for a manner, and-the table l2 which supports the crank pin grinder whichymay be attached to grinding mechanism, is carried by the lathe carthe carriage of an ordinary engine lathe to hold riage H, as previouslydescribed. the grinding wheel in firm contact with thesur- Thevfor ward end of the ro ker rm 25 carries face of a crank pin as the crank pin or-shaft a machine grooved block 21 upon which is slid- I '31, ably mountedan adjustable jaw 28 having a Other objects and advantages of this invention V-shaped work-gripping end 29. p The adjustwill appear throughout the following specification able jaw 28 is engaged by an adjusting screw and claims. Y -30 which ,is threaded through a collar 3i sup- In the drawings: ported upon a bracket 32 fixed to the block 0 Figure 1 is a side elevational view of the crank 21 and the forward end of the rocker arm 25 pin grinder, mounted upon alathe, certain parts as shown. A suitable handle 33-is carried by the being broken away and showninsectio'n; screw 30 to facilitate the adjustment of the ad- Figure 2'is a top plan view of the grinder, justable jaw-28. a portion of a'crank 'pinvor shaft being shown, A St o y l 34 is din a Set 190- in section; with a V-shaped work-engaging end 35, the crank Figure? is a vertical sectional view-taken on p 3 the crank Shaft being p o fit line 3-3 of Figure 1; between the V-shaped ends 29 and 35 of the re- Figure l is a vertical sectional view taken on spec v adjustable and Stationary jaws 3 and v 34 to attach the rocker arm to the pin and cause Figure 5 is a vertical sectional vi w t k on the rocker arm to move as the crank shaft 26 l 5-5 of Figure 1; i 1 I is moved or rotated upon the lathe in the con- Figure 6 is a vertical sectional view taken on Ventional manner BY noting Figure 1 it Will line of Figure 1; e 1 be seenthat the conventional lathe face plate Figure #2 is a vertical sectional view taken on is indicated by the numeral Th stationary 35 line of Figure i jaw 3d is provided with a longitudinal channel By referring tovthe drawings, it will be seen 8 n w h i y and l' bly mounted that H] designates the conventional engine lathe a shaft 39, d this is held in pos t by a which carries a conventional lathe carriage ll Suitable Clamp at the end thereof- The sh ft 401113011 which is secured a working table 12 39 is Provided With'a pairof upstanding a 40 i 5 or desired manner. The motor 2| is provided 50 so as to allow the upwardlye through the medium of the'headed bolts [3 which M n which ears is pivota'ny mounted a fit within the dove-tail slots 14 formed in the pending tongue 4? of a square sliding bar or head lathe carriage N. This table I2 is provided with A wul'nalrm 44 1S PYOVlded o Connecting a dove-tail tongue l5 upon which is slidably the a with the p as Shawn F 45 mounted a slidably adjustable block l6 carrying fif 5321 ggg fi if ggt g gggfg f gg move longitudinally of the table l2, and the -gulde 9 15 provided wlth later-ally extending ournals 4'! through which an adJustmg screw hanger 15 adapted to rock upon the Journal 48 is threaded, the screw having an operating 50 V handle 49 at its upper end to facilitate the op- Th1S hanger 'PQ an m Whlch eration thereof, The lower end of the screw 48 ms the motor supporting plate 20, d a m to is connected to the upper face of the stationary 2| is mounted upon the plate 20 in any suitable jaw, by means of a ball and socket connection tending guide 46 to be swung toward or away from the work as the screw 48 is adjusted, this being possible due to the sliding of the head 43 within the guide 46. The guide 46 also carries an upwardly extending sleeve 5| upon its front face within which sleeve is rotatably mounted a grinding spindle 52 carrying a pulley 53 at its upper end around which the bolt 24 previously mentioned passes. The grinding spindle 52 carries a grinding element 54 at its lower end which may be secured to the spindle 52 in any suitable or desired manner, such for instance as by means of a threaded cap 55.

From the foregoing description it will be seen" that a very efiicient and simple meanshas beenprovided for attaching the mechanism to the crank pin by means of the jaws 34 and 28, whereby the crank pin may be held against displace- ,ment from engagement with the grinding apparatus. The crank shaft as stated previously, is held between the lathe centers and is adapted to rotate, the sliding block 46 reciprocating upon the table [2- as the crank shaft rotatesand the hanger l8 rocking upon its journal I], thereby allowing the parts to automatically adjust themselves and follow the movement of the crank shaft 25 in its rotation. The grinding spindle 52 is driven by means of the belt 24 from the motor 25' and the grinding element 54 is moved to the proper position by the adjustment of the shaft 39 and a proper pressure is maintained between the crank pin 36 and the grinding element 54 through the adjustment of the screw 48 to keep a proper pressure of the grinding element 54 upon the surface of the crank pin 36 which is being ground. The jaw '28 is,-of course, adjusted properly to permit the crank pin 3% to rotate between the adjustable 1 and stationary jaws and the screw it maybe adjusted to maintain a proper pressure of the grinding element 54 upon the pin 36. The rotationof H the crank shaft 26 will cause all of the parts with the exception of the table I2, to move and accommodate themselves to a proper position as the by the rocker arm for connecting the rocker arm shaft 26 rotates.

It should be understood that certain detail changes in the construction and arrangement of parts may beemployed Without departing from the spirit of the invention, so long as such changes fall within the scope-of the appended claims.

Having described the invention, what I claim (18 new is:

l. A crank pin grinding device of theclass 612- I scribed comprising a table, a crank shaft supporting means carried by the table, a member slidably mounted for longitudinal movement upon the table, a'hanger journaled and suspended from said slidably mounted member, a rocker arm suspended on said hanger, a stationary jaw carried I by said rocker arm and adapted to engage a crank pin, an adjustable jaw adjustably mounted upon the rocker arm for engaging the crank pin and holding the rocker arm in association with the crank pin, a grinding spindle supported atap- I proximately right angles to the stationary jaw,

a grinding member carried by the spindle, means for adjusting the spindle toward and away from the stationary jaw, means for rotating the spindle, means for supporting the spindle, means-for adjusting the spindle longitudinally of the. sta-' 2. A crank pin grinding device of the, class described comprising a suppqrting table, a crank shaft supporting means, carried by said table, a.

rocker arm suspended upon the supporting table at one end and having upward and downward swinging movement with respect to the table, means for supporting the rocker arm upon the table, said means being adjustable longitudinally of the table, a crank pin engaging means carried by the rocker'arm for connecting the rocker arm wi'th a crank pin, a grinding mechanism comprising a longitudinally adjustable supporting member carried by the rocker 'arm, an upstanding member pivotally secured to said supporting member, ansoutwardly'sliding head carried by said upstanding member, a rotating spindle carried by said sliding head,. a grinding member carriedoby the spindle, means for rotating said spindle, a threaded rod carried by said supporting member and pivoted thereon, and means car-. ried by the sliding head and engaging said adjustable member for moving the rotating spindle to, and from aicrank pin carried by the rocker arm. v

. 3. A crank pin grinding device of the class described comprising a supporting table, a crank shaftasupporting. means carriedby said table, a rocker arm suspended upon the supportinggtable at one end and having upward and downward swinging .movernent with respect to the table, umeansnfor supporting the rocker arm upon the table,-'said means being adjustable longitudinally .ofthe table, a crank pin engaging means carried with a crank pin, a grinding mechanism compris ing a longitudinally adjustable supporting memher carried bythe, rocker arm, an upstanding member pivotally secured to said supportingfl' member, an outwardly slidingvhead carried by said upstanding member, a rotating spindle car riedby saidsliding head, agrinding member carried by said spindle, means for rotating said spindle, athreaded rod carried by said supporting member and pivoted thereon, means carried by the' slidinghead and engaging said adjustable member for moving the grinding spindle to'and fr om a crank pin carried by the rockerarrn, said means for rotating the spindle comprising a driv- 3 ingmotor suspended by said rocker arm and constituting a counter-balance for said rocker arm, and means connecting the motor with the rotat in spindle.

CARL J. 000K. 

